Multielement cathode ray tube



Sept. 22, 1936. B. KWARTIN 2,055,174

MULTIELEMENT CATHODE RAY' TUBE I Filed May12, 1931 11TH; f mw- -Q I BERNARD KwAm-m y aorneg.

wire or radio.` I

ma@ ser. affres cannons; my 'runs Application 5 l. :l [N

This invention relates to epparatusfor receiving light pictures and more particularly to improvements in electronic receivers such as areV employed for receiving light pictures which have been transmitted froma remoteA point by 'either Heretofore and `prior to thisinvention it has been proposed and various attempts have been made in electronic receivers which function more of vthose which have been employed heretofore.'-

or less in' accordance with vthe principles of the Braun tube. These tubes are all characterized in that one endthereof is provided with la fluorescent screen or target the visible iluorescence of which may be varied in `accordance with the intensity of the electronic stream which is set up in the tube; Considerable difii-f variations in cult?, however, has been encountered inthe use of this tube due to the fact that it has not been possible to enlarge the'slze of theqtarget orscreenf 20 upon which the light images appear withoutcausing the latter to be considerably distorted.

It is among the principal objects of the present invention to provide a multiple-element electronic tube' which makes possible the facsimile reproduction of transmitted light pictures upon 'a screen which is considerably. larger than any A further object-of the invention is the pro vision of .an electronic receiver-wherein a pluz; L d Kwtm, lBm *Y* 1 12;; resi. semaine. tasses (Giese-.215) 1 u 1 in the facsimile.reproductionof trtted light pictures and as a high frequency interrupter independently of its use asa television receiver, all as will appear more fully hereinafter, as shown lin the accompanying drawing, andas Lv' pointedout in the appended claims. In the accompanying drawing, which illustrates certainv preferred embodiments of the present invern- Figure 1 is a diagrammatic illustration ci' an electronic interrupter constructed infaccordance with and embodying the principles of the present invention; y

I*igure 2l is a diagrammatlc'illustrationfoi an electronic interrupter which is capable of interrupting an electric circuit at 'a greater frequency for each cycle oiapplied current than that shown Figure electronic receiver constructed in vaccu in Figure 1; M

3 is a diagrammatic illustration of an with and embodying the principles of the present invention; and

Figure 4 is a diagrammatic illustration ofthe receiver when viewedat right angles to Figure 3.'

. Referring now to the drawing and more particularly to Figures 1. and 2 thereof, the electronic interrupter, designatedgenerally by the refer-` ence numeral l0, essentiallycomprisesa Braun rality ofy thermionic cathodes are employedi'or` producing a corresponding number of electron streams each of which latter is'adapted toscan a predeterminedU portion of aconsiderably enlarged fluorescent screen' or target.

A still further object of' the invention is the provision in an-electronicreceiver of 'a' plurality of thermionic cathodes each of which is indin vi'dually capable of producing its own electron stream, these cathodes being selectively energizedin predetermined order Vby means ofen electronic interrupter forming part of the receiver. I

Stillanother and'important object of this invention is the provision of an electronic interrupter which is capable of interrupting an electube preferably of the type having a thermionic u cathode II,- a control element I2, anranode I3- and apair of plates Il-j-M for deflecting the electronic stream s in na horizontal plane. In the form of tube shown in Figure 1, a. metallic plate v I5 is suitably supported within the tube adjacent lthe outerj enlarged end vI8 thereof.V It will be observedthat this electrically conductive plate l5, which may be in the form of a.` slightly arcu' ated strip intersectingthe plane of oscillation o! the electronic stream s', is arranged with the op- .posite ends thereof terminating short' ofthe opposed side walls'oi' the tube.

` The thermioniccathode suitable manner, as by a source of potential l1 n is energized m any.

i to produce .-theelectron stream awhich latter tric circuit at frequencies of -very high order,

the interrupter being designed'to interrupt the circuit two or more times for eachv oscillation of the electronic stream.

Other objects of the invention will appear more fully hereinaftenn- It will be understood that the invention consists substantially in' the combination, construction, location and relative arrangement rof parts,

as well as in method ofemploylng the same.

passes throughthe tubular anode -and toward the' plate lli. The oscillatory` movement of the stream s is controlled by an electrostatic ileld established between the plates I4.Il, these plates being respectively connected to the terminals of a suitable oscillator (not shown) of .any desired frequency. By proportioning the plate IU suchv that the angle a is lass than the-angle through which the electronic stream s oscillates, it will be .observed that for each oscillationvof the 'elec-- Vtronic stream the circuit Il will be interrupted twice, the first interruption when the stream s leaves the plate at the point A. Attention is here directed to the fact that during the interval the electronic stream s is conned within the limits of the angle a it serves to complete the circuit I8, the plate I serving as one terminal of this trical conductive plates I9 and 29' are employed circuit and the thermionic cathode as the other. l

In Figure 2, a modied arrangement of electronie'interrupter is shown wherein a pair of elecinstead of the single plate I5 of Figure l. Where two such plates I9 and 20 are employed, the circuit |8 is interrupted four times for each oscillation of the electronic stream s, the first interruption occurring when the stream s leaves the plate I9 at C, the second when it leaves the plate 29 at D, the third when it leaves the plate 20 at E, and the fourth when it leaves the plate I9 at F. It will be understood of course that by still further multiplying the number of electrical conductive plates, a corresponding increase may be had in the number of interruptions for each cycle of current applied to the deflecting plates |4-|4. It

will also be'understood that instead of employing l an electrostatic field for effecting an oscillatory movement of the electronic stream s, the same effect may be-obtained by means of an electromagnetic field established through the'use of a pair of opposed .electro-magnets the energy for -which is supplied by the oscillator.

Referring now to Figures 3 and 4, it will be observed that the electronic interupter of the character just described has been incorporated as an element of an electronic receiver such as may be used in connection with the facsimile reproduction of transmitted light pictures. This velectronic receiver comprises a Braun tube 2| to the outer and enlarged end 22 of which is secured an auxiliary axially extending tube 23 the outer encl of which is provided with a fluorescent screen v or target 24. The portion 2| of -the receiver is again preferably of the type having a thermionic cathode 25, a. control element 29, an anode 21, and a pair of plates 29--29 for deecting the horizontal streams s in a horizontal plane. Suitably mounted within the interior of the portion 2| of the receiver and adjacent the intermediate wall 22 thereof are a plurality of electrically conductive plates 29. In the particular instance shown. three such p1ates29 are employed, the

'several plates being electrically independent of each other. `Suitably arranged within the intel rior of the portion 29 of the receiver and immediately adjacent the intermediate wall-22 thereof are' a'plurality of thermionic cathodes 90,

one terminal of each of'which is respectively-conn nected to one of the plates 29. The opposite terminals of these cathodes are electrically connected together and to the therrnionic` cathode- 25 through a suitable source of supply 9|.

It will be observedas the electronic stream s' oscillates in a horizontal plane under the influence of the horizontal deilecting plates 28-r28, the several secondary thermionic cathodes 90 are. selectively energized in a predetermined order depending upon which of thevplates 29 the electronic stream s' is in contact with. The sec- 76 ondary cathodes 90 are uniformly spaced horizontally of the rear end of the portion 29 ofthe receiver and are-,gelach provided with a suitable control element 92 and an anode '33. In addition,

g each secondary cathode is provided with a'pair of horizontal deectingplates 94-95 for controlling the horizontal Adeflection o f the electronic stream s", which emanates from the cathode 90. It will be understood of course that as each of these secondarythermionic cathodes 99 is energized an electronic stream s" is produced the outer end of which is adapted to strike the fluorescent stream or target 24. The several sets4 of horizontal deflecting plates 34--95 are connect-- ed in parallel and are adapted to be energized by a suitable oscillator (not shown). In addition to the horizontal deilecting plates 94-95, the receiver is provided with a pair of vertical deilecting plates 96-31 for eifectinga vertical deection of the'electronic stream s". It will-thus be understood thatthe movement of each electronic stream s" is controlled by electrostatic elds applied to the plates 94-95 and the plates 9.9-91. It will also be .observed that due to the provision of a plurality of thermionic cathodes each of which is adapted to produce its l own electronic stream s", it becomes possible to scan a much larger screen than has been possible heretofore with the result that a larger faci commonly affect the'several electron streams s" independently of the action of the interrupter and in the same manner as they ordinarily aifect thev electron stream which is produced in the usual single element receiver.

\While in the illustrated arrangement. the portions 2| and 29 of.` the receiver` are shown as being integrally united to constitute a single formed asseparate units adapted cally connected together.

While it is preferable to employ electrostatic elds for eilecting the horizontal and vertical i0" be elemdeflection of the electronic streams s' and si', it

will be understood of course that electromagnetic ilelds may be employed with good effect for this purpose. Other advantages and modifications may also be made from time to time without departing from the real spirit or general principles of the invention and it is accordingly intended to claim the same broadly, as well as specically, as

indicated by the appended claims.

What is claimed as new and useful is:- l."A cathode ray tube for television systems lincluding a plurality of secondary thermionic cathodes energizable from a single source of energy and each of which is individually capable vunit, it will be understood that they may be of producing its own electron beam, an accelerating electrode for each' ofsaid cathodes. an electronic interrupter interposed between said source of energy and said cathodes operative to successively energize .the latter in predetermined order.

a primary cathode for producing a beam capable of electrically connecting said energy source and said interrupter, and electrically energized beamdeecting means for causing the beam produced by e'achof said-cathodes tooscillate in a given plane and at a predetermined frequency.

2. A cathode ray tube for television systems including a plurality of secondary thermionic catho des energizable from a single source of energy andeach of which is'findividually capable oi' .producingitsown electron beam, al1-accelerating electrode for each of said cathodes, an electronic interrupter interposed between said source of energy' and said cathodes operative to successively energize the latter inxpredetermined order, a primary cathode 'for producingv a beam capable of` electrically connecting said venergy source and said interrupter, and electrically energized beam-deliecting means for causing a l vertical deiiection ofthe beams yproduced thereby., Y

3. A cathode ray tube for television systems -including a plurality of secondary thermionic cathodes energizable from a single source of energy and each of which is individually capable of producing its own; electron beam, an accelerating electrode for each of said cathodes, an electronic interruptor interposed between said source of energy 4and said cathodes operative to successively energize the latter in predetermined order, a primary cathode for producing a beam capable of electrically connecting said energy source and said interrupter, and electrically enand the like including a plurality oi laterally spaced secondary therminic cathodes.- said cathodes being adapted for selective energization whereby to produce separate electron beams. an acceleratingelectrode for each of said cathodes. a primary thermionic 'cathode for effecting the successive `energization of said secondary cathodes, and a plurality or pairs of deflecting plates for respectively effecting oscillation of the sev.

eral beams in the plane common to said cath-- odes, the angular displacement of each beamV being such lthat the beams supplement one another in 'scanning adjoining portions of a. fluo` rescent screen or target.

5. A cathode ray tube for television systems including a plurality of secondary thermionic cathodes energizable from a single source of energy and each of which is individually capable of producing its own electron beam. an accelerating electrode for each of said cathodes, and an electronic interrupter including a single primary thermionic cathode anda coacting anode for generating an electronic beam and a pair of dei'lectors for effecting the oscillation of said beam whereby the latter completes the energizing circuit to each of said secondary predetermined order.

BERNARD KWARTIN.

cathodes in- 

